Bolt fastening



Aug. 14, 1928. 1,681,048

LE ROY PU RCELL Filed Jan. 12, 1926 3 a J'g. 51

gunuuuum 7 15 (w 45 c). 4. l/ x9/ 5 7 68 Patented Aug. 14, 1928- vPATENToFFlcE.

LE BOY PUB GEIL, O1' J'UDSON, INDIANA.

BOLT FASTENING. I

Application med January 12, 1828. serial no. 80,841.

This invention is directed to an improvementtin terminal fastenings forbolts used in connecting Wood or similar Sections together, and isprimaril adapted to forming a fas- 6 tening having t readed Cooperationwith the bolt, seating in an appropriately formed countersinksurrounding the bolt terminal, and formed to interlock with the wall ofthe countersink to hold the fastening against 10 turning.

It has hefetofore been diflicult to simply and securely hold a bolt usedto'unite Wood Sections, particularlyin cabinet or like work,

- in that the fastening must be of a nature to permit easy applicationWith' usual tools, c must be. capable of being readily disconnected whennecessary, and yet must lie flush With'the surface in which it isembedded, or even below such surface, in order to conceal the connectionwhere otherwise exposed, or to permit the proper fitting of Aoverlyingparts. In this connection the usual nut Will not serve the purpose, asit must be exposed to permit the application of a Wrench, and

ordinaril cannot be concealed.

The o ject of the present invention is therefore to provide a fasteningof this type formed to interfit in a countersink in the Wood surface andhaving outstanding fins of peculiar form to cut into and interlock withthe Wall of the countersink as the fastening is driven in place, withthis application permitting the threaded openin throu h the fastening tobe properly aline With t e bolt opening to permit the bolt to bethreaded into the fastening.

The invenion 1s`i11ustrated in the accompanying drawing, in which 2- F11`` is a view in section,'with the bolt '40 and asteningv in elevation,illustratmg the application of the improved fastening.

' Fi 2 is a view of the bolt in elevation and t e 'fastening in section,the parts bemg shown se arated. i Fig. 3 1s an end view of thefastening.

Fig. 4 is a perspective view of the fasten- In the drawings the usualbolt 1 shown as connecting two Wood Sections 2, has the usual '50 kerfedhead 3 countersunk in one of the Wood Sections. The opposite end of thebolt must be secured to maintain the connection, and heretofore it has'been the. usual practice to bore a cylindrical recess around the boltopening of sufiicient size to permit the use of an ordinary nut, whichafter being applied is concealed by a disk closing the outer end of therecess.

The present form of fastening is directed to avoiding the constructionusually employed, and at the same time avoiding the difiiculties ofapplying and removing such fastenings. To this'end the present fasteningis in the form of a frustro-conical member 4, centrally formed With athreaded opening 5 tov receive the bolt, and formed .with cutting andlooking fins 6 on its peripheral surface. The member 4 is externally ofa size and Shape to accuratelyfit an ordinary countersink,f

so that in providing for the use of the improved securing means all thatis necessary, after boring the Wood Sections for the pasvSage of theIbolt, is to countersink the Wood about the Outlet ofithe bolt opening.

An important feature of the present improvement are the fins 6, whichWhile here shown as two in number and diametricallyopposed, mayobviously be in any desired number and in any relative arrangement.These fins are integral with the body of the fastening member, and havetheir base portions coextensive With the length of the peripheral Wallof the member. In side elevation the fins are substantially triangularwith one edge, as 7 practically in the plane of the small or inner endof the fastening, and the remaining edge, as 8, substantially arallelWith the axis of the member. The mner edge 7 of the fin is comparativelysharp to form a cutting edge, while the outer edge 8 is rather blunt,and in fact suchedge 8, viewed in elevation, as in Fig. 4, isoftriangular outline.

. In appl'ying the fastening after countersinking the' appropriateopening, the latter is simply driven into the countersink until theouter end of the member is flush With the Wood surface. In this operatiothe member When finally positioned accurately fits and fills thecountersink, so that the threaded-opening 5 of the memberis in line iwith the bolt opening. In thus appl ing the member, the fins 6 cut intothe wal the countersink, the edge 7 formingn cuttingedge. As the memberis the ally the widened edge 8 forms a Wedge-like resistance to anyssible turning of the mem-y ber. The bolt 1s then a plied, seated by theusual screW-driver, an threaded into the fastening. If the end ef thebolt projects beyond the outer surface of the fastening,

lof`

seated the fins are Well Within the Wood and such projectionimay befiled off or otherwise removed, with the result that when properlyapplied a perfectly secure fastening is rovided, with the outer surfaceperfectly ihsh with the surface'of the Wood.` Of course the fastenine'is easily removed by disconnecting the holt a short distance, and thendriving on the headed end of the bol't to dislodge the fastening.

The improvedfastening is perfectly fiush with the surface to which it isapplied, and yet holds the bolt and Wood sections as secure as With anordinary nut. The iinportant features are the form of the fastening tolit the ordinary eountersink, and the provision and particularly theform of the fins to interlock with the Wood to prevent turning of thefastening.

Having thus described the invention, what is claimed as new is Afastening for the threaded end of a bolt and adapted to be whollyembedded in formed opening in the material, eomprising a conieal bodyWith an inner end face and an outer end face of circular form and inparallel relation, the outer end face accurately fitting within theouter end of the formed opening and being fiush with the surface of thematerial, and fins projecting in diametrically-opposed'relation from andbeyond the inelined side Wall of the fastening, the respective ends ofeach fin being in alinement with the respective end faces of the body,the diameter of the fastening taken through the fins being uniform forthe full len th of the fastener, the outer faceslof the s beingtriangular with their apices in alinement With the inner face of thebody and their bases in alinement and mero'ing into the contour of theouter face of the fastener, whereby the fins present a sharp end inalinement With and extending in both direetions beyond the inner face ofthe fastener and are of gradually inereasing thickness and of graduallyde-' creasing width from the inner face to the outer face of the body.

In testimony whereof, I aflix my signature.

LE ROY PURCELL.

